I loved the idea of the Doctor as someone's imaginary friend. The way she said she'd known him 'since I was seven' suggests the possibility of other visits in between seven and twenty-three, doesn't it?

This reminded me of nothing so much as The Timetraveller's Wife! Probably an influence - but let's face it, so was RHD's Casanova! :-)

I really did love this episode - things seem to be getting better and better after a rather uneven start. Pile on that angst, lads - we wants it!